ReactOS 0.4.15-dev-8408-g466a198
varray.cc
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1/*
2** License Applicability. Except to the extent portions of this file are
3** made subject to an alternative license as permitted in the SGI Free
4** Software License B, Version 1.1 (the "License"), the contents of this
5** file are subject only to the provisions of the License. You may not use
6** this file except in compliance with the License. You may obtain a copy
7** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
8** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
9**
10** http://oss.sgi.com/projects/FreeB
11**
12** Note that, as provided in the License, the Software is distributed on an
13** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
14** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
15** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
16** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
17**
18** Original Code. The Original Code is: OpenGL Sample Implementation,
19** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
20** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
21** Copyright in any portions created by third parties is as indicated
22** elsewhere herein. All Rights Reserved.
23**
24** Additional Notice Provisions: The application programming interfaces
25** established by SGI in conjunction with the Original Code are The
26** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
27** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
28** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
29** Window System(R) (Version 1.3), released October 19, 1998. This software
30** was created using the OpenGL(R) version 1.2.1 Sample Implementation
31** published by SGI, but has not been independently verified as being
32** compliant with the OpenGL(R) version 1.2.1 Specification.
33*/
34
35/*
36 * varray.c++
37 *
38 */
39
40//#include "glimports.h"
41//#include "myassert.h"
42//#include "mystdio.h"
43#include "varray.h"
44#include "arc.h"
45#include "simplemath.h" // glu_abs()
46
47#define TINY 0.0001
48inline long sgn( REAL x )
49{
50 return (x < -TINY) ? -1 : ((x > TINY) ? 1 : 0 );
51}
52
53
55{
56 int i;
57
58 varray = 0;
59 size = 0;
60 numquads = 0;
61
62 for (i = 0; i < 1000; i++) {
63 vval[i] = 0;
64 voffset[i] = 0;
65 }
66}
67
69{
70 if( varray ) delete[] varray;
71}
72
73inline void
75{
76 register long ds = sgn(arc->tail()[0] - arc->prev->tail()[0]);
77 register long dt = sgn(arc->tail()[1] - arc->prev->tail()[1]);
78
79 if( dir[0] != ds || dir[1] != dt ) {
80 dir[0] = ds;
81 dir[1] = dt;
82 append( val );
83 }
84}
85
86void
87Varray::grow( long guess )
88{
89 if( size < guess ) {
90 size = guess * 2;
91 if( varray ) delete[] varray;
92 varray = new REAL[size];
93 assert( varray != 0 );
94 }
95}
96
97long
98Varray::init( REAL delta, Arc_ptr toparc, Arc_ptr botarc )
99{
100 Arc_ptr left = toparc->next;
101 Arc_ptr right = toparc;
102 long ldir[2], rdir[2];
103
104 ldir[0] = sgn( left->tail()[0] - left->prev->tail()[0] );
105 ldir[1] = sgn( left->tail()[1] - left->prev->tail()[1] );
106 rdir[0] = sgn( right->tail()[0] - right->prev->tail()[0] );
107 rdir[1] = sgn( right->tail()[1] - right->prev->tail()[1] );
108
109 vval[0] = toparc->tail()[1];
110 numquads = 0;
111
112 while( 1 ) {
113 switch( sgn( left->tail()[1] - right->prev->tail()[1] ) ) {
114 case 1:
115 left = left->next;
116 update( left, ldir, left->prev->tail()[1] );
117 break;
118 case -1:
119 right = right->prev;
120 update( right, rdir, right->tail()[1] );
121 break;
122 case 0:
123 if( glu_abs(left->tail()[1] - botarc->tail()[1]) < TINY) goto end;
124 if( glu_abs(left->tail()[0]-right->prev->tail()[0]) < TINY &&
125 glu_abs(left->tail()[1]-right->prev->tail()[1]) < TINY) goto end;
126 left = left->next;
127 break;
128 }
129 }
130
131end:
132 append( botarc->tail()[1] );
133
134 grow( ((long) ((vval[0] - vval[numquads])/delta)) + numquads + 2 );
135
136 long i, index = 0;
137 for( i=0; i<numquads; i++ ) {
138 voffset[i] = index;
139 varray[index++] = vval[i];
140 REAL dist = vval[i] - vval[i+1];
141 if( dist > delta ) {
142 long steps = ((long) (dist/delta)) +1;
143 float deltav = - dist / (REAL) steps;
144 for( long j=1; j<steps; j++ )
145 varray[index++] = vval[i] + j * deltav;
146 }
147 }
148 voffset[i] = index;
149 varray[index] = vval[i];
150 return index;
151}
152
unsigned int dir
Definition: maze.c:112
#define index(s, c)
Definition: various.h:29
long numquads
Definition: varray.h:51
void update(Arc *, long[2], REAL)
Definition: varray.cc:74
Varray()
Definition: varray.cc:54
~Varray()
Definition: varray.cc:68
REAL * varray
Definition: varray.h:48
long init(REAL, Arc *, Arc *)
Definition: varray.cc:98
long size
Definition: varray.h:54
void append(REAL)
Definition: varray.h:61
void grow(long)
Definition: varray.cc:87
long voffset[1000]
Definition: varray.h:50
REAL vval[1000]
Definition: varray.h:49
class Arc * Arc_ptr
Definition: arc.h:50
float REAL
Definition: types.h:41
#define assert(x)
Definition: debug.h:53
GLint GLint GLint GLint GLint x
Definition: gl.h:1548
GLuint GLuint end
Definition: gl.h:1545
GLsizeiptr size
Definition: glext.h:5919
GLuint index
Definition: glext.h:6031
GLdouble GLdouble right
Definition: glext.h:10859
GLint left
Definition: glext.h:7726
GLuint GLfloat * val
Definition: glext.h:7180
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint GLint GLint j
Definition: glfuncs.h:250
#define ds
Definition: i386-dis.c:443
static DWORD DWORD DWORD DWORD * steps
Definition: cursoricon.c:1638
#define long
Definition: qsort.c:33
REAL glu_abs(REAL x)
Definition: simplemath.h:50
long sgn(REAL x)
Definition: varray.cc:48
#define TINY
Definition: varray.cc:47